BACTERIAL STRAIN FOR LEAD PRECIPITATION

摘要

The present invention relates to a mutant CC3625 cysteine synthase. Bacteria containing such mutant cysteine synthase can be used for the precipitation of soluble lead.

主权项

1. A mutant CC3625 cysteine synthase protein having an amino acid sequence that differs from SEQ ID NO: 1 in a way selected from the group consisting of
a) substitution of alanine in place of threonine at position 32, b) substitution of valine in place of phenylalanine at position 101, c) deletion of lysine at position 129, and d) both substitution of threonine in place of methionine at position 271 and substitution of proline in place of serine at position 287,the mutant CC3625 cysteine synthase protein conferring to a Caulobacter crescentus strain that expresses it a greater capacity to precipitate soluble lead than a strain that expresses the CC3625 cysteine synthase having the amino acid sequence SEQ ID NO: 1.